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<div class="title">ThreadLocal.h</div>  </div>
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<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">// This file is part of Eigen, a lightweight C++ template library</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">// for linear algebra.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">// Copyright (C) 2016 Benoit Steiner &lt;benoit.steiner.goog@gmail.com&gt;</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">// This Source Code Form is subject to the terms of the Mozilla</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">// Public License v. 2.0. If a copy of the MPL was not distributed</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160; </div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor">#ifndef EIGEN_CXX11_THREADPOOL_THREAD_LOCAL_H</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#define EIGEN_CXX11_THREADPOOL_THREAD_LOCAL_H</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160; </div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#ifdef EIGEN_AVOID_THREAD_LOCAL</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160; </div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#ifdef EIGEN_THREAD_LOCAL</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#undef EIGEN_THREAD_LOCAL</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160; </div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#else</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160; </div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#if ((EIGEN_COMP_GNUC) || __has_feature(cxx_thread_local) || EIGEN_COMP_MSVC )</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#define EIGEN_THREAD_LOCAL static thread_local</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160; </div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment">// Disable TLS for Apple and Android builds with older toolchains.</span></div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="preprocessor">#if defined(__APPLE__)</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment">// Included for TARGET_OS_IPHONE, __IPHONE_OS_VERSION_MIN_REQUIRED,</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment">// __IPHONE_8_0.</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="preprocessor">#include &lt;Availability.h&gt;</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="preprocessor">#include &lt;TargetConditionals.h&gt;</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment">// Checks whether C++11&#39;s `thread_local` storage duration specifier is</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment">// supported.</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="preprocessor">#if defined(__apple_build_version__) &amp;&amp;     \</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="preprocessor">    ((__apple_build_version__ &lt; 8000042) || \</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="preprocessor">     (TARGET_OS_IPHONE &amp;&amp; __IPHONE_OS_VERSION_MIN_REQUIRED &lt; __IPHONE_9_0))</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment">// Notes: Xcode&#39;s clang did not support `thread_local` until version</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment">// 8, and even then not for all iOS &lt; 9.0.</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="preprocessor">#undef EIGEN_THREAD_LOCAL</span></div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160; </div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="preprocessor">#elif defined(__ANDROID__) &amp;&amp; EIGEN_COMP_CLANG</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment">// There are platforms for which TLS should not be used even though the compiler</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="comment">// makes it seem like it&#39;s supported (Android NDK &lt; r12b for example).</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment">// This is primarily because of linker problems and toolchain misconfiguration:</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment">// TLS isn&#39;t supported until NDK r12b per</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="comment">// https://developer.android.com/ndk/downloads/revision_history.html</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="comment">// Since NDK r16, `__NDK_MAJOR__` and `__NDK_MINOR__` are defined in</span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="comment">// &lt;android/ndk-version.h&gt;. For NDK &lt; r16, users should define these macros,</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment">// e.g. `-D__NDK_MAJOR__=11 -D__NKD_MINOR__=0` for NDK r11.</span></div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="preprocessor">#if __has_include(&lt;android/ndk-version.h&gt;)</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="preprocessor">#include &lt;android/ndk-version.h&gt;</span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="preprocessor">#endif  </span><span class="comment">// __has_include(&lt;android/ndk-version.h&gt;)</span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="preprocessor">#if defined(__ANDROID__) &amp;&amp; defined(__clang__) &amp;&amp; defined(__NDK_MAJOR__) &amp;&amp; \</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="preprocessor">    defined(__NDK_MINOR__) &amp;&amp;                                               \</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="preprocessor">    ((__NDK_MAJOR__ &lt; 12) || ((__NDK_MAJOR__ == 12) &amp;&amp; (__NDK_MINOR__ &lt; 1)))</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="preprocessor">#undef EIGEN_THREAD_LOCAL</span></div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="preprocessor">#endif  </span><span class="comment">// defined(__ANDROID__) &amp;&amp; defined(__clang__)</span></div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160; </div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="preprocessor">#endif  </span><span class="comment">// EIGEN_AVOID_THREAD_LOCAL</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160; </div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="preprocessor">#include &quot;./InternalHeaderCheck.h&quot;</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160; </div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceEigen.html">Eigen</a> {</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160; </div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="keyword">namespace </span>internal {</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="keyword">struct </span>ThreadLocalNoOpInitialize {</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;  <span class="keywordtype">void</span> operator()(T&amp;)<span class="keyword"> const </span>{}</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;};</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160; </div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="keyword">struct </span>ThreadLocalNoOpRelease {</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;  <span class="keywordtype">void</span> operator()(T&amp;)<span class="keyword"> const </span>{}</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;};</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160; </div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;}  <span class="comment">// namespace internal</span></div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160; </div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="comment">// Thread local container for elements of type T, that does not use thread local</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="comment">// storage. As long as the number of unique threads accessing this storage</span></div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="comment">// is smaller than `capacity_`, it is lock-free and wait-free. Otherwise it will</span></div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="comment">// use a mutex for synchronization.</span></div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="comment">// Type `T` has to be default constructible, and by default each thread will get</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="comment">// a default constructed value. It is possible to specify custom `initialize`</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="comment">// callable, that will be called lazily from each thread accessing this object,</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="comment">// and will be passed a default initialized object of type `T`. Also it&#39;s</span></div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="comment">// possible to pass a custom `release` callable, that will be invoked before</span></div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="comment">// calling ~T().</span></div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="comment">// Example:</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="comment">//   struct Counter {</span></div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;<span class="comment">//     int value = 0;</span></div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;<span class="comment">//   }</span></div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;<span class="comment">//   Eigen::ThreadLocal&lt;Counter&gt; counter(10);</span></div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;<span class="comment">//   // Each thread will have access to it&#39;s own counter object.</span></div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="comment">//   Counter&amp; cnt = counter.local();</span></div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;<span class="comment">//   cnt++;</span></div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;<span class="comment">// WARNING: Eigen::ThreadLocal uses the OS-specific value returned by</span></div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;<span class="comment">// std::this_thread::get_id() to identify threads. This value is not guaranteed</span></div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="comment">// to be unique except for the life of the thread. A newly created thread may</span></div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;<span class="comment">// get an OS-specific ID equal to that of an already destroyed thread.</span></div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;<span class="comment">// Somewhat similar to TBB thread local storage, with similar restrictions:</span></div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;<span class="comment">// https://www.threadingbuildingblocks.org/docs/help/reference/thread_local_storage/enumerable_thread_specific_cls.html</span></div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T,</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;          <span class="keyword">typename</span> Initialize = internal::ThreadLocalNoOpInitialize&lt;T&gt;,</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;          <span class="keyword">typename</span> Release = internal::ThreadLocalNoOpRelease&lt;T&gt;&gt;</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="keyword">class </span>ThreadLocal {</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;  <span class="comment">// We preallocate default constructed elements in MaxSizedVector.</span></div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;  static_assert(std::is_default_constructible&lt;T&gt;::value,</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;                <span class="stringliteral">&quot;ThreadLocal data type must be default constructible&quot;</span>);</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160; </div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;  <span class="keyword">explicit</span> ThreadLocal(<span class="keywordtype">int</span> capacity)</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;      : ThreadLocal(capacity, internal::ThreadLocalNoOpInitialize&lt;T&gt;(),</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;                    internal::ThreadLocalNoOpRelease&lt;T&gt;()) {}</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160; </div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;  ThreadLocal(<span class="keywordtype">int</span> capacity, Initialize initialize)</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;      : ThreadLocal(capacity, std::move(initialize),</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;                    internal::ThreadLocalNoOpRelease&lt;T&gt;()) {}</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160; </div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;  ThreadLocal(<span class="keywordtype">int</span> capacity, Initialize initialize, Release release)</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;      : initialize_(std::move(initialize)),</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;        release_(std::move(release)),</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;        capacity_(capacity),</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;        data_(capacity_),</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;        ptr_(capacity_),</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;        filled_records_(0) {</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;    eigen_assert(capacity_ &gt;= 0);</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;    data_.resize(capacity_);</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; capacity_; ++i) {</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;      ptr_.emplace_back(<span class="keyword">nullptr</span>);</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;    }</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;  }</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160; </div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;  T&amp; local() {</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;    std::thread::id this_thread = std::this_thread::get_id();</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;    <span class="keywordflow">if</span> (capacity_ == 0) <span class="keywordflow">return</span> SpilledLocal(this_thread);</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160; </div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;    std::size_t h = std::hash&lt;std::thread::id&gt;()(this_thread);</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> start_idx = h % capacity_;</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160; </div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;    <span class="comment">// NOTE: From the definition of `std::this_thread::get_id()` it is</span></div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;    <span class="comment">// guaranteed that we never can have concurrent insertions with the same key</span></div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;    <span class="comment">// to our hash-map like data structure. If we didn&#39;t find an element during</span></div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;    <span class="comment">// the initial traversal, it&#39;s guaranteed that no one else could have</span></div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;    <span class="comment">// inserted it while we are in this function. This allows to massively</span></div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    <span class="comment">// simplify out lock-free insert-only hash map.</span></div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160; </div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;    <span class="comment">// Check if we already have an element for `this_thread`.</span></div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;    <span class="keywordtype">int</span> idx = start_idx;</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;    <span class="keywordflow">while</span> (ptr_[idx].load() != <span class="keyword">nullptr</span>) {</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;      ThreadIdAndValue&amp; record = *(ptr_[idx].load());</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;      <span class="keywordflow">if</span> (record.thread_id == this_thread) <span class="keywordflow">return</span> record.value;</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160; </div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;      idx += 1;</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;      <span class="keywordflow">if</span> (idx &gt;= capacity_) idx -= capacity_;</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;      <span class="keywordflow">if</span> (idx == start_idx) <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;    }</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160; </div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;    <span class="comment">// If we are here, it means that we found an insertion point in lookup</span></div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;    <span class="comment">// table at `idx`, or we did a full traversal and table is full.</span></div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160; </div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;    <span class="comment">// If lock-free storage is full, fallback on mutex.</span></div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;    <span class="keywordflow">if</span> (filled_records_.load() &gt;= capacity_) <span class="keywordflow">return</span> SpilledLocal(this_thread);</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160; </div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;    <span class="comment">// We double check that we still have space to insert an element into a lock</span></div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;    <span class="comment">// free storage. If old value in `filled_records_` is larger than the</span></div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;    <span class="comment">// records capacity, it means that some other thread added an element while</span></div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;    <span class="comment">// we were traversing lookup table.</span></div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;    <span class="keywordtype">int</span> insertion_index =</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;        filled_records_.fetch_add(1, std::memory_order_relaxed);</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;    <span class="keywordflow">if</span> (insertion_index &gt;= capacity_) <span class="keywordflow">return</span> SpilledLocal(this_thread);</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160; </div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;    <span class="comment">// At this point it&#39;s guaranteed that we can access to</span></div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;    <span class="comment">// data_[insertion_index_] without a data race.</span></div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;    data_[insertion_index].thread_id = this_thread;</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;    initialize_(data_[insertion_index].value);</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160; </div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;    <span class="comment">// That&#39;s the pointer we&#39;ll put into the lookup table.</span></div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;    ThreadIdAndValue* inserted = &amp;data_[insertion_index];</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160; </div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;    <span class="comment">// We&#39;ll use nullptr pointer to ThreadIdAndValue in a compare-and-swap loop.</span></div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;    ThreadIdAndValue* empty = <span class="keyword">nullptr</span>;</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160; </div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;    <span class="comment">// Now we have to find an insertion point into the lookup table. We start</span></div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;    <span class="comment">// from the `idx` that was identified as an insertion point above, it&#39;s</span></div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;    <span class="comment">// guaranteed that we will have an empty record somewhere in a lookup table</span></div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;    <span class="comment">// (because we created a record in the `data_`).</span></div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> insertion_idx = idx;</div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160; </div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;    <span class="keywordflow">do</span> {</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;      <span class="comment">// Always start search from the original insertion candidate.</span></div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;      idx = insertion_idx;</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;      <span class="keywordflow">while</span> (ptr_[idx].load() != <span class="keyword">nullptr</span>) {</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;        idx += 1;</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;        <span class="keywordflow">if</span> (idx &gt;= capacity_) idx -= capacity_;</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;        <span class="comment">// If we did a full loop, it means that we don&#39;t have any free entries</span></div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;        <span class="comment">// in the lookup table, and this means that something is terribly wrong.</span></div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;        eigen_assert(idx != insertion_idx);</div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;      }</div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;      <span class="comment">// Atomic CAS of the pointer guarantees that any other thread, that will</span></div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;      <span class="comment">// follow this pointer will see all the mutations in the `data_`.</span></div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;    } <span class="keywordflow">while</span> (!ptr_[idx].compare_exchange_weak(empty, inserted));</div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160; </div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;    <span class="keywordflow">return</span> inserted-&gt;value;</div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;  }</div>
<div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160; </div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;  <span class="comment">// WARN: It&#39;s not thread safe to call it concurrently with `local()`.</span></div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;  <span class="keywordtype">void</span> ForEach(std::function&lt;<span class="keywordtype">void</span>(std::thread::id, T&amp;)&gt; f) {</div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;    <span class="comment">// Reading directly from `data_` is unsafe, because only CAS to the</span></div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;    <span class="comment">// record in `ptr_` makes all changes visible to other threads.</span></div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;    <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; ptr : ptr_) {</div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;      ThreadIdAndValue* record = ptr.load();</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;      <span class="keywordflow">if</span> (record == <span class="keyword">nullptr</span>) <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;      f(record-&gt;thread_id, record-&gt;value);</div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;    }</div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160; </div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;    <span class="comment">// We did not spill into the map based storage.</span></div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;    <span class="keywordflow">if</span> (filled_records_.load(std::memory_order_relaxed) &lt; capacity_) <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160; </div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;    <span class="comment">// Adds a happens before edge from the last call to SpilledLocal().</span></div>
<div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;    std::unique_lock&lt;std::mutex&gt; lock(mu_);</div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;    <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; kv : per_thread_map_) {</div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;      f(kv.first, kv.second);</div>
<div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;    }</div>
<div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;  }</div>
<div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160; </div>
<div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;  <span class="comment">// WARN: It&#39;s not thread safe to call it concurrently with `local()`.</span></div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;  ~ThreadLocal() {</div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;    <span class="comment">// Reading directly from `data_` is unsafe, because only CAS to the record</span></div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;    <span class="comment">// in `ptr_` makes all changes visible to other threads.</span></div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;    <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; ptr : ptr_) {</div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;      ThreadIdAndValue* record = ptr.load();</div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;      <span class="keywordflow">if</span> (record == <span class="keyword">nullptr</span>) <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;      release_(record-&gt;value);</div>
<div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;    }</div>
<div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160; </div>
<div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;    <span class="comment">// We did not spill into the map based storage.</span></div>
<div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;    <span class="keywordflow">if</span> (filled_records_.load(std::memory_order_relaxed) &lt; capacity_) <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160; </div>
<div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;    <span class="comment">// Adds a happens before edge from the last call to SpilledLocal().</span></div>
<div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;    std::unique_lock&lt;std::mutex&gt; lock(mu_);</div>
<div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;    <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; kv : per_thread_map_) {</div>
<div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;      release_(kv.second);</div>
<div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;    }</div>
<div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;  }</div>
<div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160; </div>
<div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;  <span class="keyword">struct </span>ThreadIdAndValue {</div>
<div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;    std::thread::id thread_id;</div>
<div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;    T value;</div>
<div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;  };</div>
<div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160; </div>
<div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;  <span class="comment">// Use unordered map guarded by a mutex when lock free storage is full.</span></div>
<div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;  T&amp; SpilledLocal(std::thread::id this_thread) {</div>
<div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;    std::unique_lock&lt;std::mutex&gt; lock(mu_);</div>
<div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160; </div>
<div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;    <span class="keyword">auto</span> it = per_thread_map_.find(this_thread);</div>
<div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;    <span class="keywordflow">if</span> (it == per_thread_map_.end()) {</div>
<div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;      <span class="keyword">auto</span> result = per_thread_map_.emplace(this_thread, T());</div>
<div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;      eigen_assert(result.second);</div>
<div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;      initialize_((*result.first).second);</div>
<div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;      <span class="keywordflow">return</span> (*result.first).second;</div>
<div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;      <span class="keywordflow">return</span> it-&gt;second;</div>
<div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160;    }</div>
<div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;  }</div>
<div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160; </div>
<div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;  Initialize initialize_;</div>
<div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;  Release release_;</div>
<div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;  <span class="keyword">const</span> <span class="keywordtype">int</span> capacity_;</div>
<div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160; </div>
<div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;  <span class="comment">// Storage that backs lock-free lookup table `ptr_`. Records stored in this</span></div>
<div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;  <span class="comment">// storage contiguously starting from index 0.</span></div>
<div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;  MaxSizeVector&lt;ThreadIdAndValue&gt; data_;</div>
<div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160; </div>
<div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;  <span class="comment">// Atomic pointers to the data stored in `data_`. Used as a lookup table for</span></div>
<div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;  <span class="comment">// linear probing hash map (https://en.wikipedia.org/wiki/Linear_probing).</span></div>
<div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;  MaxSizeVector&lt;std::atomic&lt;ThreadIdAndValue*&gt;&gt; ptr_;</div>
<div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160; </div>
<div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;  <span class="comment">// Number of records stored in the `data_`.</span></div>
<div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;  std::atomic&lt;int&gt; filled_records_;</div>
<div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160; </div>
<div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160;  <span class="comment">// We fallback on per thread map if lock-free storage is full. In practice</span></div>
<div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;  <span class="comment">// this should never happen, if `capacity_` is a reasonable estimate of the</span></div>
<div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;  <span class="comment">// number of threads running in a system.</span></div>
<div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;  std::mutex mu_;  <span class="comment">// Protects per_thread_map_.</span></div>
<div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;  std::unordered_map&lt;std::thread::id, T&gt; per_thread_map_;</div>
<div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;};</div>
<div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160; </div>
<div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;}  <span class="comment">// namespace Eigen</span></div>
<div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160; </div>
<div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;<span class="preprocessor">#endif  </span><span class="comment">// EIGEN_CXX11_THREADPOOL_THREAD_LOCAL_H</span></div>
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